Forward Collision System Reduced Warning

[Borntorun]

This morning I went out to go get trade value on my 2018 Sierra SLT from my dealer toward a 23 or 24. When I started truck the Forward Collision System warning came on. I guess my truck likes it’s home and doesn’t want to leave! I checked and cleaned sensors on bumper and started again warning still there. I checked area behind bumper to check where sensors are plugged in appear to be connected and tight. Start again and warning still there. Is there anything else I can check before taking to dealer to see what the problem is . Anyone have this problem with there’s  ? If so what caused the problem ? Thanks for replies.

Edited August 12, 2023 by Borntorun

[mikeyk101]

Oops, I guess I didn't read thoroughly and see you tried cleaning them already...

Edited August 12, 2023 by mikeyk101
Misread post

[BO TIE 1]

Try disconnecting the battery for a few minutes. Do you have the collision alert turned on? If so maybe try just turning it off. 

[rav3]

what is the "state of charge" on your battery? Is it the original battery? Usually, small electrical issues pop up when the battery is getting old or there's bad grounds. 

[Borntorun]

Thanks for the replies. I was thinking’s about the battery also. It is the original Battery . Battery was load tested came back good. But I have learned in the past that a battery showing good can still give out some electrical gremlins. The charging is within the normal  range.At this point I have a appointment with dealer in two days and truck has a extended warranty on it so I’m going to see what they find out. If sensors check out as good and If sensor warning still shows on I will see if they can clear warning or if they think a new stronger battery will help out situation I will replace the battery.  Hopefully they find out what’s wrong and get it corrected  so I can go forward with getting trade in value on a 2024 Sierra without warning showing on dash. Thanks again for your replies !

Edited August 14, 2023 by Borntorun

[rav3]

https://youtu.be/Dql0Uu8-SNk

[Borntorun]

Ok I went to dealer today and they found no codes causing that warning to show on screen. I feel a little dumb saying this but no one else said anything about this including the original dealer who said there was a problem. So hopefully this will help others maybe . Servicing dealer today said that warning shows on screen is caused when you use the controls on steering wheel and you adjust settings sensitivity for your collision avoidance section. I’m thinking that maybe on of the employees checking out vehicle for trade value used the steering wheel controls to view oil life , engine hours / rev’s etc and unknowing click on collision avoidance section and changed setting. Thus making the warning show up on screen. That scenario would answer why I never saw warning on screen before checkout for trade value. Surprised that a employee involved in checking out vehicle for dealer wouldn’t know about this screen warning and wouldn’t tell me it needs to be serviced/ repaired. Glad no problem found and only wasted a 1/2 hour at dealer this morning . I learned something today hope this helps out other forum members.
Todays dealer adjusted / changed setting so that warning is now not showing up on screen when starting truck. 

Edited August 17, 2023 by Borntorun

[rav3]

Thanks for the heads up

[Kyle24]

I took my to dealer they had to replace the camera in the window behind the review mirror